A simple wait function that returns and promise and puts the waiting macro task queue

wait.js

const wait = callback => new Promise((resolve, reject) => {
  const end = () => {
    try {
      if (callback()) {
        resolve(true);
      } else {
        setImmediate(end);
      }
    } catch (error) {
      reject(error);
    }
  };
  setImmediate(end);
});